realtek: need to handle PHY_INTERFACE_MODE_NA for sfps

From the validate docs in include/linux/phylink.h:

 When state->interface is PHY_INTERFACE_MODE_NA, phylink expects the
 MAC driver to return all supported link modes.

Tested-by: Birger Koblitz <[email protected]>
Signed-off-by: Bjørn Mork <[email protected]>

target/linux/realtek/files-5.4/drivers/net/dsa/rtl83xx/dsa.c

@@ -245,6 +245,7 @@ static void rtl83xx_phylink_validate(struct dsa_switch *ds, int port,
 	pr_debug("In %s port %d", __func__, port);
 
 	if (!phy_interface_mode_is_rgmii(state->interface) &&
+	    state->interface != PHY_INTERFACE_MODE_NA &&
 	    state->interface != PHY_INTERFACE_MODE_1000BASEX &&
 	    state->interface != PHY_INTERFACE_MODE_MII &&
 	    state->interface != PHY_INTERFACE_MODE_REVMII &&